Well NIseko has been getting absolutely hammered almost non stop, same story here as well ( 165km south as the crow flies) I see people all the time head into neck deep powder with regular boards and make it to the other side. How many times they get stuck is the mystery. You can rent any powder board imaginable at the resorts here, so perhaps on the 'powder' days you could rent a board and go crazy and not have to throw more money out the window on a pow specific board.